Biological filter media designed specifically for Fluval Multi-Stage Canister Filters. Porous ceramic cylinders encourage beneficial bacteria growth to help eliminate harmful ammonia and nitrite levels in your aquarium water. Cylindrical design allows a large population of bacteria to grow in a minimal space while pores are perfectly sized for bacteria colonies. Great for fresh or saltwater aquariums. Each ceramic cylinder measures approximately 5/8" dia x 3/4" long. 17.63 oz box contains approximately 100 ceramic cylinders - perfect for most mid-sized (approximately 1-1/2 L) media baskets. For best use, place at the end of the filtration process.
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